<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        p {
            color: red;
        }
        .color {
            color: aqua;
        }
        .style1 {
            color: red;
        }
        .style2 {
            font-size: 35px;
        }
        #pink {
            color: red;
        }
    </style>
</head>
<body>
    <h1>Color</h1>
    <p>I'M RED</p>
    <p>I'M RED</p>
    <p>I'M RED</p>
    <p class="style1 style2">测试</p>
    <span class="color">类选择器</span>
    <p id="id">我是红色</p>
</body>
</html>